81037517280 has 96 divisors (see below), whose sum is σ = 260084641824. Its totient is φ = 21202262016.

The previous prime is 81037517279. The next prime is 81037517299. The reversal of 81037517280 is 8271573018.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1567279 + ... + 1618158.

It is an arithmetic number, because the mean of its divisors is an integer number (2709215019).

Almost surely, 2^81037517280 is an apocalyptic number.

81037517280 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

81037517280 is an abundant number, since it is smaller than the sum of its proper divisors (179047124544).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81037517280 is a wasteful number, since it uses less digits than its factorization.

81037517280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3185508 (or 3185500 counting only the distinct ones).

The product of its (nonzero) digits is 94080, while the sum is 42.

The spelling of 81037517280 in words is "eighty-one billion, thirty-seven million, five hundred seventeen thousand, two hundred eighty".